Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4d609128463c4a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-06 12:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 087d2ac5b8482ecdab2bafa3a0e67c5e SHA-1: 4bc0cf7abb83ffc6aeca388e2fe209590b000328 SHA-256: 7d4d609128463c4ae987d5739fb325cb1ff04b280f3a5c2f47421267b3b27c8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://studioferrato.it/userfiles/files/25544811713.pdf In PDF document text
    • http://villabrown.it/userfiles/files/83183272128.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/32250481276.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/perovupasilasiwodezidaloj.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/vilejuwofegu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec7908efe---lujonilevasuto.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/lirokaroju.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/80111613889.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6e375d2734da97e19c6f6fddc3d8908b/15449945766.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/65324103017.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1d65ff7129eecfb39a39e3791fc0cf77/97737830618.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16126517437550---savujelebaj.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f6c980bd8ba41a06efdd9bf8fb6dd961/renuziwolitajewojisiki.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/39998288357.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a210552ec1---dabomodogaf.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/25516110761.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/29919940731.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/jonigowelavawerimu.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/wufonifo.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/18433903140.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/552409a461937be85fa630f475c39e81/wuwurunisefilitefat.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/94856163436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ipsec+rfc+2401+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 16100 bytes
SHA-256: 44074849d6a004e8819c4c27b6ac182e30bf71fb8f830fdd01fb4907bc92a42c
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 10316 bytes
SHA-256: 34b87eb1b4c2e570b38d2276be088397467678287e7b66befac806b1a2e073c4
font_02_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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